Question 231629
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Absolutely on the right track.  But you have got to watch your signs.


*[tex \LARGE x+y=90]


*[tex \LARGE x=3y-10]


*[tex \LARGE 3y-10+y=90]


*[tex \LARGE 4y-10=90]


Perfect up to this point.  But now you need to ADD 10 to both sides:


*[tex \LARGE 4y=100]


*[tex \LARGE y=25]


*[tex \LARGE x=3(25)-10=65]


*[tex \LARGE 65+25=90]


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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